Process for joining materials



J. W. HARRIS.

PROCESS FOR JOINING MATERIALS. APPLcATloN FILED JUNE 8. 1918.

y M /iffy JONATHAN W. HARRIS, 0F MONTCLAIR,

PATENT oFE'lcE. 7

NEW JERSEY, ASSIGNOR TO WESTERN ELECTRIC COMPANY, INCORPORATED, 0F NEWYORK, N.`Y., A CORPORATION OF NEW YORK.

i I PRocEss For. JoINING MATERIALS.

Original application led October 18, 1916, Serial No.

To all whom t may concer/n.'

Be it known that I, JONATHAN W. HAR- RIS a citizen of the United States,residing at lVIontclair, in the county of Essex, State of New Jersey,have invented certain new and useful Improvements in Processes forJoiningMaterials, of which the following is a full, clear, concise, andexact description.

This invention relates to processes of joining materials and moreparticularly to processes of joining vitreous materials to metal. y

This application is a division of my copending application'Serial No.126,236, filed October 18, 1916.

In many instances it is desirable to support members composed offrangible materia-l from other rigid members. "'-In telephone'transmitter mouthpieces, it is especially desirable, from a sanitaryviewpoint, to employ for certain portions, porcelain or other similarvitreous materials which may be readily sterilized. Since portionscomposed of siich frangible materials may become chipped or otherwisedamaged under ordinary service conditions, it is desirable to attachthem to the supporting members by means adapted to absorb the shocks'received by the supporting members and to effectively prevent theirtransmission to the frangible portion. Also, due to the cushioningeffect produced by a shock absorbing junction of this character thefrangible por: tion so supported may be subjected to a considerablygreater blow without being damaged thereby than would be the case ifsuch portion were rigidly attached to the supporting member.

It is the object of this invention to provide a process for joining amember of frangible material to a rigid member by a resilient shockabsorbing binding material which is unaffected by the usual sterilizingprocess. i

The nature of the invention will appear more fully from the followingspecification and the annexed drawing, the variousligures of whichillustrate a specific embodiment thereof.

In the accompanying drawing, Figure 1 shows the assembled structure of atelephone transmitter mouthpiece manufac- Specication of Letters Patent.

Patented Nov. 23, 1920.

126,236. Divided and this application led J'une 8, 1918. Serial No.238,834. j

tured in accordance with the process of the invention; and Figs. 2, 3and 4 illustrate various, details of the structure shown in Fig. 1; y l

In a telephone transmitter mouthpiece manufactured in accordance withthe process of this invention, the body portion 5, which is usuallyfunnel shaped and preferably composed of porcelain, is provided atportion 10 and a contractedportion 11, as

most clearly indicated in Figs. 1 and 4.

The contracted portion is outwardly threaded to engage the face plate ofa telephone transmitter (not shown). The enlarged portion 1() isroughened on its inner surface in any desired manner to increaseadhesion between the surface and the binder 12.

In manufacturing a mouthpiece in accordancewiththe process of thisinvention, the binder 12, which secures the body portion 5 and theadapter 9 together is preferably applied in the form of a band or stripof rubber compound which, in assembling the structure, is wrapped aroundthe contracted portion 6 of the porcelain -body portion. It has beenlfound that very satisfactory results are obtained by using rubbercompound sheeting about le of an inch in thickness 'which is cut intostrips approximately of an inch in width and about 3% inches in length.After this strip is wrapped around the contracted and threaded portionof the porcelain body yportion the metal ferrule 9 is then pressed intoplace and held by a suitable clamp. The assembled structure is thenplaced in an oven and kept at a temperature of approximately 170 C. forone or two hours to vulcanize the rubber. This process forms a resilient'the rubber junction after vulcanization is suicient to enable it toabsorb the shocks, resultingfrom the very rough use of the mouthpieceduring service, with a minimum danger of breakage.

What is claimed is:

l. The method of forming a resilient shock absorbing binder betweenvitreous and metallic parts of an articlewhich consists in inserting alayer of vulcanizable material therebetween and subjecting such materialto a temperature of approximately 1700 centigrade for a period of fromone to two hours.

2. The method of attaching metal to a vitreous material which consistsin inserting a layer of vulcanizable material therebetween andsubjecting the same to vulcanizing temperatures for a period of from onet0 two hours.

3. The method of attaching@r metal to porcelain which consists ininserting a layer of rubber compound therebetween and sub jecting thecombined structuretoatemperau ture of approximately '170o ycentigradefor a period of from one vto two hours.

4. The method of forming a shock absorbing junction between vitreous andmetallic materials which consists in nterpos ing` a vulcanizable bindertherebetween and subjecting the structure thus produced to a temperatureof approximately 170O centigrade for a period of from one to two hoursuntil the binder forms an adhesive connection between the materials.

5. The lmethod of attaching metal to vitreous material which consists ininterposing a layer of vulcanizable material be 'tween the vitreousmaterial .and the metal and subjecting the metal, the vulcanizablematerial and the vitreous material to vulcanizing temperatures.

Inwitness whereof, I hereunto subscribe my name this 4th day of June A.D., 1918.

JONATHAN W. HARK-ls.

